Bug#980734: arc-theme is compiled for wrong gnome-shell version

Package: arc-theme Version: 20201013-1

Bug#780379: rebranded fork

> Now Palemoon project provided an option to brand binary as "New Moon", > that won't influenced by their strick branding policy. There is also a fork called "webbrowser"[1] which removes all Palemoon branding. https://git.nuegia.net/webbrowser.git/